There was a business named JEWELRY AND COIN PALACE 2301 LAS VEGAS BLVD. SO . that operated as a pawn shop. It had a connection with a business of the same name in Federal Way, Washington that also dealt in jewelry and precious metals. This may have been the business that had the silver round you mention manufactured.

My information goes back to 1998 and I believe both businesses are now closed.

A silver medal similar to your description was sold in the past and the on-line service Worth Point has information on it. You must be a paid subscriber to Worth Point to get further information in detail.

http://www.worthpoint.com/worthopedia/oz-silver-art-rnd-999-coin-palace-las-482806777